/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */

package Clases;

import java.io.IOException;
import java.io.PrintWriter;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ListIterator;
import java.util.Vector;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

/**
 *
 * @author JULIAN
 */
public class CalculaCompra extends HttpServlet {
   
    /** 
     * Processes requests for both HTTP <code>GET</code> and <code>POST</code> methods.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException, SQLException {
        response.setContentType("text/html;charset=UTF-8");
        PrintWriter out = response.getWriter();
        try {

         HttpSession session_actual = request.getSession(true);

         Vector v = (Vector) session_actual.getAttribute("carrito");

         ListIterator itr = v.listIterator();

         ObjetoProducto obj = new ObjetoProducto();
         SQL_Consultas obj2 = new SQL_Consultas();

         PreparedStatement st =obj2.GetnumeroFactura();

         ResultSet resultado = st.executeQuery();
         resultado.next();

         String nfactura = resultado.getString("factura");
         session_actual.setAttribute("factura",nfactura);


         double costototal =0;
         double ivatotal = 0;
         int cantidad =0;

         if(!itr.hasNext()){
          out.println("<html>");
          out.println("<Body Bgcolor=#000000>");
          out.println("<title>ERROR</title>");
          out.println("<p><font color=white>No hay productos en la canasta</p></font>");
          out.println("<h1><a href=SeleccionaProductos.jsp>Regresar</a></h1>");
          out.println("</html>");

                         }
         else {

          while(itr.hasNext()){

                  obj = (ObjetoProducto) itr.next();
                  cantidad=Integer.parseInt(obj.getCantidadP());
                  costototal=costototal+(Double.parseDouble(obj.getPrecioP()))*cantidad;
                  ivatotal = ivatotal+(Double.parseDouble (obj.getivaP()))*cantidad;
                  
                              }
             session_actual.setAttribute("costot",Double.toString(costototal));
             session_actual.setAttribute("ivat",Double.toString(ivatotal));
             response.sendRedirect("Factura.jsp");
            }

        } finally { 
            out.close();
        }
    } 

    // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
    /** 
     * Handles the HTTP <code>GET</code> method.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        try {
            processRequest(request, response);
        } catch (SQLException ex) {
            Logger.getLogger(CalculaCompra.class.getName()).log(Level.SEVERE, null, ex);
        }
    } 

    /** 
     * Handles the HTTP <code>POST</code> method.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        try {
            processRequest(request, response);
        } catch (SQLException ex) {
            Logger.getLogger(CalculaCompra.class.getName()).log(Level.SEVERE, null, ex);
        }
    }

    /** 
     * Returns a short description of the servlet.
     * @return a String containing servlet description
     */
    @Override
    public String getServletInfo() {
        return "Short description";
    }// </editor-fold>

}
